Reverse lights. new bulbs still not work - 2001 Volvo V70 XC

Did it have reversing lights originally? All of the lights are monitored by the BCM. Things could get funky if they were there and are now missing.

Check the bulbs with a multimeter and also check that the bulb contacts aren't corroded.

The easiest fix is to find a good local auto-electrician.

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Does bulb socket have a ground wire, or just uses mounting point as ground? Check for voltage at each part of system. Start with fuse, then switch both in and out of reverse, then bulb.

Hey I'm having the same problem with my BMW 320d 2005 car. Fuses, switches ,bulbs are all fine abd reversing lights still not working . Please help me out

My guess would be the neutral safety switch on the transmission.
The switch also acts as a backup light switch when the shifter is in reverse.
I would check for power at the switch for the reverse light circuit.

The reverse light switch is a mechanical device used to control operation of the vehicle reverse lights. The switch is designed to complete the circuit when reverse gear is selected allowing reverse light operation (manual transmission only).

Have you checked for voltage at the light socket with the bulbs removed? If no voltage, then you may have a bad reverse switch. If you have voltage, (with car off, car in reverse, and ignition on) the try new bulbs. Even a bulb that LOOKS good can be bad

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Hello. The symptoms you are describing are likely due to a poor ground. Temporarily install a new ground wire by securing a piece of copper wire to the frame with a self tapping screw. Use this ground wire along with the hot wire to see if each of these lights works. If it does, trace the ground wire back to the frame, unscrew it and clean up the metal with emery cloth so you reestablish a good ground.

If the blinker and reverse lights work on the bad side maybe a new socket.

connect a new light on to the same circuit as the reversing light, take the postive off the reversing light, the earth goes to ground on the new light

have you checked the fuse?